Princes Highway Upgrade – Gerringong to Bomaderry
Foxground and Berry Bypass
Report on preparation of route feasibility comparative cost estimates
Appendix B1
Design:
Berry Bypass original southern route design submission received Dec 2011
Princes Highway Upgrade – Gerringong to Bomaderry
Foxground and Berry Bypass
Report on preparation of route feasibility comparative cost estimates
Appendix B2
Design:
Princes Highway Gerringong to Bomaderry concept design criteria
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
PRINCES HIGHWAY GERRINGONG TO BOMADERRY
CONCEPT DESIGN CRITERIA
Purpose
The purpose of this list of design criteria is to clarify design criteria listed in the Scope of Work and Technical Criteria for the development of the Concept Design for the 32km section of the Princes Highway between Gerringong (Mount Pleasant) and Bomaderry (Cambewarra Road – Main Road 261) 42.6 km to 74.6 km south of Wollongong.
Interpretation of these Criteria
(a) The criteria in this document are minimum criteria, including technical, operational and performance requirements for the Princes Highway Upgrade. The approval of the RTA’s Representative is required for the adoption of alternative criteria or standards. Where alternative criteria or standards are adopted they must be clearly identified in an appendix to the relevant Design Report.
(b) If more than one criterion applies in respect of any part of the Highway then direction must be sought from the RTA’s Representative.
(c) The Highway must meet the standards of RTA and AUSTROADS publications and relevant Australian Standards. If suitable Australian Standards do not exist for the design of any element of the Highway, the Designer may use international standards that reflect world’s best practice, subject to the written approval of RTA’s Representative. 1. Order of Precedence
(i) Any specific provisions in this document
(ii) Project Scope of Works and Technical Criteria;
(iii) RTA Technical Directives
(iv) RTA publications;
(v) AUSTROADS;
(vi) Australian Standards;
(vii) Standards Australia handbooks; and
(viii) Other reference documents and standards.
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
2. Traffic (for geometric element design)
Design Year – Highway and Local Roads Proposed completion year plus 20 years Traffic flow based on the 100th highest hour to reflect the recreational peak flows
Level of Service LOS C or better
Road users (highway, local roads, property access) Highway – 25m B-double, 12.5m single unit (emergency U-turn bay),19m semi-trailer (access U-turn Bay) refer Figure 9 & 10 Local Road - 19m semi trailer unless designated a B-double access Property Access – 19m semi trailer farm residence and paddock access by negotiation with the land owner
Truck Speed - 100km/h Truck acceleration and deceleration rates – refer to Figure 12.1 and 12.1
Clear Zone and Safety Barrier Analysis Adopt 50% - 50% slow lane / fast lane split for analysis at year of completion plus 20 years
Transfer from Sand Track – assume 90%
3. Control Line
Standard RTA labelling convention in accordance with CADD Manual Issue Version 3.2 June 2005
Control line to be string located in centre of carriageways with superelevation rotated about the control axis to facilitate future lane additions.
Horizontal alignment of each carriageway may be independent of each other with control on the median side edgeline.
4. Highway Alignment – New Dual Carriageway Criteria Requirement Reference Comment Design Speed Horizontal alignment 110km/h SWTC 1.6 Design Speed Vertical alignment 100km/h SWTC 1.6
Crest K min value 66 RDG Table 2.3.6 (2.5s)
Sag K main value 33.4 RDG Table 2.3.8 (Headlight considerations)
Reaction Time (RT) 2.5 sec RDG Table 2.1.1
Plan Transition <1000m Radius RDG Table 2.2.2 & 2.2.3 (C)
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Superelevation Transition <1000m Radius RDG Table 2.2.2 & 2.2.3 (C)
Must not overlap causing “butterfly” shaped pavements
Sightline Eye Height Car Truck
1.15m 2.4m
RDG Table 2.3.6
Horizontal Stopping Sight Distance 210 RDG Table 2.1.1
Vertical Stopping Sight distance 175 RDG Table 2.3.6 (2.5s)
Approach Sight Distance & Safe Intersection Sight Distance
1.15m to 0m 1.15m to 1.15m
RDG Figure 2.3.3 At all intersections, emergency crossovers, truck rest areas, farm accesses & paddock accesses
Horizontal radius Min 600m for on-highway upgrade
RDG Table 2.2.1
Min 750m for off-line construction
As directed by RTA A reduction to 600m will be considered but approval is required for each specific site
Arc Length 20% reduction acceptable
RDG Table 2.2.2 Anything less than the RDG must be reported
Compound Curves If unavoidable must be in same design speed range
Pacific Highway 4.2 Must be reported
Reverse Curve Spacing for curves without horizontal transitions
>Design speed in metres
RDG Section 2.2.23
Grade Des Max 6.0% RDG Table 2.3.1 (Rolling terrain)
Abs Max 8.0% As directed by RTA Min in cutting 0.5% As directed by RTA Vertical curve excluded
5. Highway Alignment - Ramps Criteria Requirement Reference Comment
General arrangement (on-load and off-load)
Figure 6
RTA Entry and Exit Ramps Rev 1.1 Figure 6 and Grade Separated Interchanges (A Design Guide) NAASRA 1984
Must have full deceleration occur in the auxiliary lane ie no deceleration in the through lane
Level of service - For design year 20 years after completion
LOS C or better Austroads Traffic Engineering Practice – Part 2
Design flow based on 100th highest hour
Design Speed Off-load Ramp
110km/h at start of diverge and gore area As per Fig 6
Figure 6
60km/h at local road intersection
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
On-load Ramp Trucks at minimum 85km/h at point “T”
Provision for cyclists Comply with RTA guidelines
RTA NSW Bicycle Guidelines and Austroads Traffic Engineering Practice – Part 14
Include provision at all interchanges RTA Guidelines, see Fig 7.22
Sightline To start of auxiliary lane To gore nose
350m desirable 350m absolute min
Figure 6
Reaction Time 2.5 seconds As directed by RTA
Horizontal Alignment (ramp proper) To suit speed regime RDG Section 2
Vertical Alignment (ramp proper)
To suit speed regime
Table Figure 6
Terminal To suit 19m semi trailer unless designated a B-Double access
RDG Section 4 and RTA Roundabouts Geometric Design Method
Provide furniture to suit B-double turning movements. Linemarking to suit 19m semi-trailer turning movements
6. Highway and Ramp Cross Section Criteria Requirement Reference Comment Upgrade lanes (in each direction) Ramps
2 1 SWTC 1.3 With provision for future
widening in median Climbing Lanes Loss of truck speed to
40km/h and LOS D 20 years after construction
As directed by RTA Refer to Email 20/03/09
Confirmed by RTA Standards & Policy Climbing lane to occupy ultimate 3rd lane (narrow median, Ref Figure 3)
Lane width (including interchange ramps and aux lanes)
3.5m As directed by RTA
Nearside (outside) shoulder 2.5m As directed by RTA
3.0m sealed clearance adjacent to safety barrier to cater for cyclists, maintenance and emergency services vehicles (also applies to auxiliary lanes)
Offside (median) shoulder Min 1.0m RDG Section 3.3.3
Median width - No right turn bay - Right turn bay treatment required
10.2m (edgeline to edgeline) 13.0m (edgeline to edgeline)
As directed by RTA RDG 4.8.18
To suit future upgrade to 3 lanes with wire rope barrier 3.2m between edgelines To facilitate future intersection treatment
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
with 6m wide median
Outside verge (adjacent 4 to 1 or flatter batters) Outside verge (adjacent barrier)
Adopt 2m rounding commencing at shoulder Adopt 2m rounding commencing 0.5m outside wire rope safety barrier
RDG Table 6.14 RDG Table 6.14
For driver to maintain control To maintain max 10:1 slope at extremity of wire rope deflection
Median verge (adjacent 4 to 1 or flatter batters) Min 0.5m As directed by RTA Only applies on
independent alignments
Cutting berm (adjacent SO gutter) Min 0.5m Des 2.0m
To suit recommendations of the geotechnical report
Note that it may exceed these dimensions to accommodate sight lines, rock fall zones and catch fence treatments
Outside clear zone < 10% slope - 11.0m 10% to 4:1 batters max 14m
RGD Section 3.7
Clearance to boundary Min 6.0m As directed by RTA
Need to allow for sedimentation structures and access for maintenance between catch or diversion drains and boundary. Consider widening on a case by case basis where a geotechnical risk exists.
Gutters Located outside of shoulders
Figure 2 & 5 WRSB located 0.2m from edge of gutter G4 SB 0m offset from SO gutter
Flood immunity 1:100 years for new structures. A minimum of 1:20 years if an existing structure can be utilised subject to structural capacity adequate for new design life
SWTC 1.2 (assumed both lanes in both directions)
Provide a clearance of 0.5m above the 1:100 year flood level to the lowest edge of shoulder. Prove that the adoption of a structure with a 1:20 year flood capacity does not exacerbate flooding.
Batters Fill < 1.5m high Fill > 1.5m high Cut 2:1 or flatter Cut steeper than 2:1
4:1 2:1 7m maximum between benches 10m maximum between benches
Refer to the project Geotechnical Reports
Not to exceed clear zone 4m wide bench at max 10m Provide 50m long end rounding
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Bridges
Outside shoulder Min 3.0m As directed by RTA Shoulder width on bridges to match approach shoulder width
Median shoulder Min 1.0m As directed by RTA
Vertical clearance Over highway Over regional and local road Over railway (future DC electric)
5.3m 4.6m 5.8m
RDG Section 3
Allow for duplication on western side
Span length for super T girders (1800mm deep)
Des Max 35m Abs Max 37m
As directed by RTA Preferred over existing road and railway
7. Alignment – Temporary Tie-ins
Design speed (horizontal and vertical alignment)
Longer term situations such as tie-ins between construction stages - 80km/h min. -100km/h - when speed environment may be perceived as high speed e.g. south of Berry Short term - 40km/h
Reaction time
- 2.5 seconds, longer term
- 1.5 seconds, short term
Clear zone
- RDG clear zones apply
Cross section -1.0m min. shoulders (subject to sightlines)
- 2 x 3.5m min. traffic lanes 8. Alignment – Local Roads
Design Standard - Road Design Guide
Design speed (horizontal and vertical alignment) - 60km/h.
Vertical alignment - Grade – desirable maximum 6% - maximum 8% or as required to match existing
Reaction time - 1.5 seconds
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Clear zone - RDG clear zones apply
Cross section - 2.0m min. sealed shoulders (subject to RDG requirement for 3.0m when adjacent to barrier lines)
Council requirements - to be negotiated
9. Intersection, crossovers, farm accesses, etc
Facility Strategy - Intersections – replace intersections with junctions where possible by linking local roads - Median cross-overs – 5km average spacing, refer Figure 8 (for contra flow provisions, in addition to U-turn facilities) - U-turn facility – 2.5km average spacing, preferably in adjoining local roads, refer Figures 9 & 10 for on highway U-turn facilities, - Buses and service vehicles encouraged to use U-turn facilities on local roads as stops, especially for school children . - Farm access – left in, left out (protected right turn only if no available U-turn facility) - Heavy Vehicle Rest Areas – one for each direction of travel, preferably located in close proximity to sewerage facilities -Heavy Vehicle Inspection Bays – one in each direction - Stockpile sites – 3 required (3,500m2 – min 40m long), 1 each between Gerringong and Kiama LGA boundary, Kiama LGA boundary and Berry and Berry and Bomaderry - Detail required at concept stage must address road safety, environmental management and the capacity of the facility to provide the service required.
Local Road Intersection - left in, left out along with protected right turn bays and turn facilities on local roads, - left turn deceleration lane where warranted by traffic volumes). -Left turn configuration to “BAL” treatment - Bus stop off highway where possible - Protect right turn deceleration lane - 3.5m wide with 0.5m shoulder, refer Figure 7 - Cyclists to use highway shoulder - Provide safe intersection sight distance – use sight benching if necessary - Concept design to show location and layout with sufficient investigation to ensure turn paths, sight distance so that adequate land reservation can be provided.
Emergency crossovers - Design speed – 40km/h - Designed in accordance with Figure 8 - Min sight distance 210m required - Movements - allow 25m B-double to cross - Concept design to show location and indicative layout
Emergency U-turn bays - Provided for emergency services - Designed in accordance with Figure 9, where no other U-turn facility is available - Safe intersection sight distance required for through vehicles and 5 seconds minimum gap sight distance for turning and entering vehicles, refer RDG Section 4.9.4
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
- U-turn for 12.5m single unit truck to cross with verge widening to accommodate the turned path, so that adequate land reservation can be provided - Concept design to show location and indicative layout
Access U-turn bays - Provided for adjacent landholders, refer Figure 10, where no other U-turn facility is available - U-turn for farm access 19m semi-trailer (ensure sufficient land reserved) - Safe intersection sight distance required for through vehicles and 5 seconds minimum gap sight distance for turning and entering vehicles, refer RDG Section 4.9.4 - Concept design to show location and layout with sufficient investigation to ensure turn paths, sight distance and adequate land reservation can be provided
10. Drainage
Highway Strategy - To carry out hydrologic/hydraulic investigations and assessments in accordance with the Scope of Works and Technical criteria, Section 4.38. - Flood immunity for a design flood event requires the lowest edge of shoulder to be 0.5m above the respective high flood level, refer to Figure 1. - Replace all existing drainage structures and cattle underpasses where function is required for the upgraded highway - Identify cost savings in retaining any structures that are in good condition and have a suitable service life. - The following minimum average recurrence intervals must be applied to elements of the design (select only those applicable for concept design) (i) Culverts where surcharge is allowable 50 years (ii) Structures where surcharge is undesirable 100 years (iii) Channels and open drains 5 years (iv) Gutter flow spread limited to width of shoulder 10 years (v) Piped system (including pits) 10 years (vi) Major storm event check for no property damage 100 years (vii) Major storm event check for no structure damage 2000 years - Climate change allowance – increase storm intensity by 6% for each storm event - Cross drainage should be separated from pavement drainage systems - Provide sufficient land acquisition near water crossings for installation of accidental spill and sedimentation basins of appropriate size, Refer "Managing Urban Stormwater – Soils and Construction" Volume 1(the Blue Book)
Local Road Strategy - Provide a flood immunity target of 1:20 year flood event - Retain existing structures where possible
Surface Flow - Drainage structures are required where works intercept runoff from floodplains, watercourses, depressions or drainage lines - Concept design must specify structure size, location and indicative inlet and outlet treatment (eg 2 cell 1800mm x 900mm box culvert 35m long, 30 degree skew at 43.700km, standard headwalls, rock mattress inlet protection 6m wide x 10m long, with outlet dissipater type D, etc) -Invert levels, profiles and headwall detail not required for concept design but sufficient investigation is required to ensure specified cover requirements can be achieved as this could impact on the vertical alignment or road boundaries - Bridge drainage must be connected to the road drainage system.
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Pavement Drainage - Adopt a minimum pipe size of 450mm dia for all drainage - Indicative drainage networks should be shown where they will be required and fit with the transverse drainage system, eg in a large cutting determine a discharge at the outlet point and distribute flow over a typical pit and pipe network system.
Subsurface Drainage - No details required at concept stage
11. Structures
Bridges - Width – refer to Section 6 - Provide a general arrangement drawing that shows the plan view, profile and cross section in accordance with SWTC Section 4.15 (ix)
Culverts - refer to Drainage Section 10
Retaining Walls - Concept design should include sufficient analysis to enable location, length, max height and face area to be specified with a wall type recommended that will suit the foundation and load conditions
12. Tunnels
Facility Strategy
- Separate bores for each carriageway - Include provision for cyclists at this stage - Provide for future expansion to 3 lanes preferably at 100kph, with an alternate cyclist facility -Provide for dangerous goods passing through the tunnel
Design Standard
- Refer to Pacific Highway design guidelines
13. Barriers
Barriers - Steel wire rope preferred subject to horizontal and vertical curve limitations - Show where G4 will be required such as tight radius curves at access points
Terminals - identify the type of terminal to suit the situation.
14. Environmental measures
Noise impacts - Traffic noise mitigation measures must be incorporated into the concept design, ie lowering vertical
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
alignment, noise mounds, noise wall location, dimensions, bridge joint design, pavement surfacing etc.
15. Other facilities
General - In accordance with Scope of Works and Technical Criteria – Refer Section 4.15
Sign posting - Show directional & Tourist signs
Streetlighting - V3 Design Standard in accordance with As1158.1.1
16. Presentation
General - In accordance with CADD Manual Version 3.2 June 2005 Refer to Victoria Creek Deviation example - In accordance with the Scope of Works and Technical Criteria – Refer Section 4.15 - On A3 sheets
Sheet Index - List sheets in concept design
Typical Cross Sections - Show sufficient sections to describe the major elements
Plan and Longitudinal Section - Horizontal 1:2000, vertical 1:400 (min) – preferably 10:1 distortion with breaks if necessary
Detail Plan - Scale 1:1000 - 2 sections per sheet are satisfactory if not too cluttered - Include conceptual drainage scheme - Show safety barrier locations - Include services (add separate drawing if details are too cluttered) - Show line marking - Show diagrammatic signposting scheme - Show light pole locations
Cross sections - Spacing 10m on curves and lane tapers, 20m elsewhere
Upgrading the Princes Highway
Figure 2 - Shoulder Widths and Configurations
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
30m
Mer
ge t
aper
offs
ide
lane
s
FORM
2LANES
MERGE
LEFTLANEENDS
RIGHT
KEEP LEFTUNLESS
OVERTAKING
Div
erge
tap
erA
uxili
ary
over
taki
ng la
ne
180
- 25
0m
Figure 3 - Auxiliary Overtaking Lane
Upgrading the Princes Highway
1.0 1.0
Narrow Median
5.0 m
1.7 m (min)*
1.0 1.0
5.0 m
1.7 m (min)*
Narrow Median (with drainage)
1.0* 1.0*
Narrow Median (alternative)
0.6 m
Type F Barrier
Shoulder
ShoulderShoulder
Shoulder Shoulder
2.6 m
* Ensure sight distance requirements are met
Figure 5 - Narrow Median Treatment
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
Figure 6 - Acceleration / Deceleration Lengths on Ramp
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
0 20 40 60 80 100 120 140 160 180 2000
200
400
600
800
1000
1200
1400
1600
1800
80km
/h
100
km/h
110 km
/h
Example 1
VOLU
ME
INTH
RO
UG
HLA
NE
(VPH
)700 600 500 400 300 200 100
(D) LENGTH OF DECELERATION LANE (incl. taper )
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Figure 7 - Minimum Length of Deceleration Auxiliary Turning Lanes
VOLUME TURNING (VPH)
(T)L
ENG
THO
FTA
PER
FULL LENGTH DECELERATION
2030405060708090
100110
NOTES
Example 2
Example 3
(T) - This length of taper defines the path of the diverging vehicle. For superior definition of the auxiliary lane a short straight taper (20m min) can be adopted.
For right turns use fulllength deceleration lane above 1200 vph
Use full length deceleration lanein this segment
Consider reorientation of intersection in this segment
D1 - Diagram to Define Dimensions
D2 - Diagram to Define Dimensions Right Turn Auxiliary Lane
Left Turn Auxiliary Lane
*B - See Fig 4.8.18 & 15
Correction to D for Grade
Grade Ratio of length on grade to length on level
Left Turn Auxiliary Lanes Reduction to D when exit speed ≥20 km/h
20 km/h 10 m reduction 30 km/h 15 m reduction 40 km/h 25 m reduction 50 km/h 40 m reduction 60 km/h 55 m reduction 70 km/h 75 m reduction 80 km/h 100 m reduction 90 km/
Upgrade Downgrade 0 - 2% 1.0 1.0 3 - 4% 0.9 1.2 5 - 6% 0.8 1.35
h 125 m reduction
Upgrading the Princes Highway
Figure 8 - Emergency Crossover Facility
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
Figure 9 - Emergency U-Turn Bay
6.5m min to providefor heavy vehicles
Turning path to suitdesign vehicle travelspeed 5 - 15 km/h.
32m desirable minimumfor articulated vehicles
Island and median layout governedby design vehicle turning path.NOTE: B = Total length of auxiliary lane including
taper, diverge / deceleration and storage. Refer to Figure 8.
B
70 - 90O
Figure 10 - Access U-Turn Bay
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
Figure 11- Typical Heavy Duty Pavements
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
Semi starting at 100km/hFully Laden
0
10
20
30
40
50
60
70
80
90
100
0 500 1000 1500 2000 2500 3000 3500 4000Distance (m)
Spee
d (k
m/h
) 2% grade4% grade6% grade8% grade
Figure 12.1 - Semi-Trailer Deceleration Rates
TRUCK ACCELERATION RATES
0
10
20
30
40
50
60
70
80
90
100
110
-6%-5%-4%-3%-2%-1%0%1%2%
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Acceleration Length (m)
Speed(km/h) 3%
4%5%6%7%8%9%10%
Figure 12.2 - Truck Acceleration Rates
Upgrading the Princes Highway
VC CURVATURE AND SIGHT DISTANCE RELATIONSHIPS
1.00
10.00
100.00
1000.00
40 60 80 100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
420
440
460
480
500
SIGHT DISTANCE (m)
MEA
SUR
E O
F C
UR
VATU
RE
(K)
O/H SAG CLEARANCE EYE HEIGHT TO EYE HEIGHT EYE HT TO HEADLIGHT (0.75m)EYE HT TO OBJECT (0.2m) EYE HEIGHT TO ROAD
Figure 13 - Vertical Curve – Sight Distance Relationships
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
VERTICAL CURVE LENGTH FOR TRUCK O/H CLEARANCE (4.6m)
0
50
100
150
200
250
0 1 2 3 4 5 6 7 8 9 10 11 12
Algebraic Change in Grade (%)
VC L
engt
h (m
)
100908070
Figure 14 - Vertical Clearances
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
Figure 15 - Emergency Help Telephone Bay / Truck Lay-By
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Upgrading the Princes Highway
Gerringong to Bomaderry Geometric Parameters – Issue 1.0
Princes Highway Upgrade – Gerringong to Bomaderry
Foxground and Berry Bypass
Report on preparation of route feasibility comparative cost estimates
Appendix B3
Design:
Princes Highway Gerringong to Bomaderry concept design criteria addendum: Foxground and Berry Bypass specific design criteria
PRINCES HIGHWAY GERRINGONG TO BOMADERRY
CONCEPT DESIGN CRITERIA
ADDENDUM: FOXGROUND AND BERRY BYPASS SPECIFIC DESIGN CRITERIA
Purpose
This addendum supplements the Princes Highway Gerringong to Bomaderry Concept Design Criteria
for the development of the Concept Design for the 32km section of the Princes Highway between
Gerringong and Bomaderry.
The purpose of the Concept Design Criteria is to provide a list of design criteria is to clarify design
criteria listed in the Scope of Work and Technical Criteria for the development of the Concept
Design for the 32km section of the Princes Highway between Gerringong (Mount Pleasant) and
Bomaderry (Cambewarra Road – Main Road 261) 42.6 km to 74.6 km south of Wollongong.
This addendum provides additional clarification of design criteria listed in the Scope of Work and
Technical Criteria for the design development in the Foxground and Berry bypass section of the
works. This addendum applies to the works between chainages 7600 and 20400 (Foxground Road to
Flying Fox Creek).
Interpretation of these Criteria
Interpretation of these Criteria
(a) The criteria in this document are minimum criteria, including technical, operational and
performance requirements for the Princes Highway Upgrade. The approval of the RTA’s [RMS’s]
Representative is required for the adoption of alternative criteria or standards. Where alternative
criteria or standards are adopted they must be clearly identified in an appendix to the relevant
Design Report.
(b) If more than one criterion applies in respect of any part of the Highway then direction must be
sought from the RTA’s Representative.
(c) The Highway must meet the standards of RTA [RMS] and AUSTROADS publications and
relevant Australian Standards. If suitable Australian Standards do not exist for the design of any
element of the Highway, the designer may use international standards that reflect world’s best
practice, subject to the written approval of RTA’s [RMS’s] Representative.
Section 6 - Highway and Ramp Cross Section Criteria Requirement Reference Comment
Upgrade lanes (in each
direction)
Ramps
2
1
SWTC 1.3
Figure 6.1
Figure 6.2
With provision for
future widening from
the outer edge of the
formation
Flood immunity
1:100 years for new
structures. A
minimum
SWTC 1.2 (assumed
both
lanes in both
Provide a clearance of
0.5m above the 1:100
year flood level to the
of 1:20 years if an
existing structure can
be utilised subject to
structural capacity
adequate for new
design life
directions)
lowest edge of
shoulder.
Prove that the
adoption of a structure
with a 1:20 year flood
capacity does not
exacerbate flooding.
The Works must be
designed so that the
Main Carriageways are
protected by physical
means to prevent
flooding. The edge line
on the pavement
surface of the Main
Carriageways must be
above the 1:100 year
average recurrence
interval (ARI) flood
level, as detailed by the
flood level in Figure
9.10.
Precast arches Dimensions Figure SK002 Option of using precast
arch bridge
Figure 6.1